Simple modeling of Donnan separation processes

Shiran Ring, David Hasson*, Hilla Shemer, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The objective of this work is to analyze the kinetics of Donnan dialysis processes by simplified models enabling convenient characterization of the major features of separations of practical interest. The steps involved in a Donnan separation process are convective mass transfer of ions from the feed solution compartment to the solution-membrane interface, diffusion of the ions through the ion exchange membrane to the membrane receiver side and convective mass transfer of the ions from the membrane-solution interface to the receiver solution compartment. Two simple models are derived to characterize limiting transport mechanisms - a model describing transport under mass transfer control and a model describing transport under membrane diffusion control. Experimental data covering a range of Reynolds numbers and a range of solution concentrations can then serve to identify mass transfer parameters, solution concentrations and membrane diffusivities prevailing in the system under various operating conditions. Application of these concepts is fully illustrated by derivation of the two limiting models for sulfate ions transport from feed to receiver by chloride stripping ions and by providing experimental evidence in full support of the proposed approach.

Original languageEnglish
Pages (from-to)348-355
Number of pages8
JournalJournal of Membrane Science
Volume476
DOIs
StatePublished - 5 Feb 2015
Externally publishedYes

Keywords

  • Diffusion control
  • Donnan dialysis
  • Mass transfer control
  • Modeling
  • Sulfate-chloride system

Fingerprint Dive into the research topics of 'Simple modeling of Donnan separation processes'. Together they form a unique fingerprint.

Cite this